Malicious PDF — malware analysis report

Static analysis result for SHA-256 172ef5c88f812d17…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 00:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9616cc5f6df0cbfa055bbaaaad3bf765 SHA-1: f77db6078064c5c1931c4787fca594bbdc93a909 SHA-256: 172ef5c88f812d175f9eb36b787ca86fe34f6f6eef1be2abd003ab72145748c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to PDFs hosted on compromised WordPress sites, suggesting a link farm used for distributing malicious content. The PDF itself appears to be a lure, with the document body containing garbled data, and the embedded URLs are likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac6f80eaa---senuzaxame.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee413c6eb3---53528335588.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/85243205210.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/xixex.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9e981ae8---41005205324.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d18e8b9fa2---wejosogirifegusakirakiwa.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94504a93d7---foxanedo.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/11437098973.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/72978704751.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/1837729700.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608513d0b8913---57873724407.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160929e4964f81---66716347870.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1126418e1---53062203600.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/45000026596.pdfIn PDF document text
    • http://www.centralperdana.com/file/21832063245.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a8cb2c32---56495911613.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ps0aiigv1rff1946jne216m7t1/nakamak.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/zulikoxivunowaxakop.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/62923028348.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/razosu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da70bc60be1---tepotigefalor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=apps+prototyping+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 17220 bytes
SHA-256: 86719f54a49b44bcaaf3e9d7ca40e744d06a253815c6ba8e2f58d1183bf50fee
font_01_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 10428 bytes
SHA-256: 26373eef3a8de0ccdfdc11294120d4fd773c1a62389984bc28216b10e091965c
font_02_sfnt_off00011f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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